I volunteer my time at a church to do light management of their intranet network. I am not a network expert so there is a limit to what I can do.
The other day, the church's intranet went down. The main error message I was seeing was related to "IP conflict".
I used a free network scan tool to scan the intranet and came up with a weird result.
Basically, what I found was that different computers (with different IP's - both static and dynamic IP's) had same MAC address. The MAC address in question is all same and is belong to a Amped Wireless equipment (F8:7B:8C).
As the problem was getting worse, additional computer's MAC address was being corrupted with the same MAC address (about 10 computers per minute).
What would cause something like this?
The network in question has a Netgear FVS336G v2 as the firewall/VPN router and a Netgear switch (not sure which model). It is connected to the internet by Comcast business line. It also has 2 wireless AP's (all Cisco - SMB model) connected to it as well.
Here is the picture of the scan:
Edited by rkwon, 08 August 2012 - 01:52 PM.